US 2484975 A
Description (OCR text may contain errors)
Patented Oct. 18, 1949 SHIPPING CONTAINER Raymond H. Van Saun, Richmond, CaliL, as-
signor to California Container Corporation, Oakland, Calif., a corporation of Delaware Application November 22, 1948, Serial No. 61,439
The present invention relates to a paperboard container, and more particularly to a container of the type commonly used for the packing and shipment of various commodities and products, although the invention is not limited to shipping containers. Containers according to this invention are formed of three parts, provided with means for so strengthening the essential portions of the containers that relatively light material may be used throughout. The end and top edges particularly of the containers are reinforced. The common practice in the art is to employ material heavy enough to give the required strength with conventional construction, resulting in waste of material and increased expense because some portions of the container must then be heavier and stronger than necessary.
It is an object of the present invention to provide a paperboard container which is so reinforced at essential portions that it may be made of relatively light material without sacrifice of strength. Another object is the provision of a paperboard container so reinforced as to require use of less material than would otherwise be needed to give comparable strength. A further object of the invention is the provision of a paperboard container in which the principle of the angle member is utilized to increase strength while conserving material. Still another object is to provide a container with hand holes so reinforced as to substantially eliminate material failures at these troublesome weak points. A still further object is the provision of a container with top flaps, in which means are provided for frictionally retaining the flaps in closing position. It is also an object of the invention to provide a paperboard container made of a plurality of parts which may be readily assembled and in which the reinforcement of desired portions may be accomplished simultaneously with the assembling. An additional object is the provision of a group of blanks which may be readily set up and secured together to form a paperboard container realizing the objects stated above.
Other and further objects and advantages of the present invention will be apparent to those skilled in the art from the following description and the appended drawing, in which:
Fig. 1 is a perspective view of a container representing one embodiment of this invention;
Fig. 2 is an enlarged fragmentary view of a portion of Fig. 1, with parts broken away;
Fig. 3 is a plan of a blank for one part of the container of Fig. 1; and
Fig. 4 is a plan of a blank for another part of the container of Fig. 1.
The invention is illustrated and described as embodied in a container l0, Fig. 1, which is made of three partsa main body part formed from the blank I i of Fi 3, and two end parts each formed from a blank l2, shown in Fig. 4. The body part comprises a bottom IS, a pair of side walls l4 extending from opposed edges of the bottom, and a pair of top flaps l5, one extending along the upper edge of each side wall l4, or in other words the edge opposite that connected to the bottom. Bottom end flaps I6 extend from the end edges of the bottom I 3, and side end flaps H from the ends of the side walls M, while end portions or flaps G8 are hinged on the ends of the top flaps i5. Each end part comprises an end wall 69 with side flaps 20 hinged on opposite side edges thereof. Along the top edge of the end wall, and preferably also along the top edges of the side flaps 20, there extends a reinforcing flap 2! which in the formation of the container is folded down to strengthen the upper portion of the end wall. The free edge of the flap 2! has a portion cut out to povide an indentation 22 therein so that the flap 2! may partially surround a hand hole 23 formed in the end wall l9. The hole is provided by partially cutting a hand hole flap 24 from the endwall. The flap 24 is left connected to the wall along the top edge of the hand hole 23, and is folded upwardly to extend between the end wall l9 and the reinforcing flap 2l.- As clearly evident from Fig. 2,
a triple thickness of material is provided by this construction above the hand hole, where the greatest-strains are imposed in lifting of the container. In addition, the flap 2i reinforces the end wallnot only above the hand hole but below the top edge thereof adjacent the ends of the hole, by reason of the indentation 22, as clearly shown in Figs. 1 and 2. The end' wall is most apt to tear at the upper corner portions of the hand hole, where the greatest strains occur in lifting the container. Because it extends. below the top edge of the hole 23 and is there secured to the end wall 19, the reinforcing flap 2| relieves these stresses, distributing them over a relatively large zone about the hand hole. The risk of failure of the material adjacent the hole 23 is thus practically eliminated.
In making the container, a pair of the blanks I2 is prepared by folding each so that the flap 24 lies between the end wall l9 and the flap 2|, the
parts being secured as by the staples 25, and the connections of the side flaps 20 with the end wall are broken." The blank I l is folded on the lines of connection between the several panels so that the side walls II and top flaps l5 are perpendicular from each other.
to the bottom l3 and the various end flaps II, II, and I8 are at right angles to the panels from which they extend. The flaps l8 and I! at one end are 7 end of the container is similarly assembled and.
secured. It will of course be understood that the parts are properly dimensioned for a good snug fit. The securement of the end wall parts to each other may be made at the time the end walls and end flaps are secured together. If desired, of course, the construction may be reversed, with the flaps 20 on the outside of the container and the flaps l1 inside, with the flaps l8 either out or in. Securing means other than the staples 25 may be employed.
The container l may now be filled and the top flaps l swung down over the top. The flaps l5 are of substantially the same length as the side walls It, and while shown as of less than half the width of the end walls, may be of such width as to meet or overlap, if desired. In the embodiment illustrated, the flaps are narrow to provide for desired ventilation of the intended contents. The flaps l5 when folded down over the top of the container serve of course as means to retain the contents therein, but they also provide ledges which facilitate stacking of the containers one upon another. In addition, the top fiapsstifien the top edges of the side walls and add strength to the container top on the principle of'theangle member, and hold the container against spreading longitudinally, when their end portions 88 are disposed as explained hereinafter.
It will be noted from Figspl and 2 that the uppermost staple 25 securing each side wall and flap H to the adjacent end wall i9 is spaced from the tops of the end flap and end wall to leave appreciable unsecured areas between these parts at the upper corners of the end wall. These unsecured areas serve as pockets for receiving in frictional engagement therein the end portions 98 of the top flaps i5 when the latter are swung down over the top of the container 10. Since the flaps I7 lie closely against the walls H, the pockets must be somewhat greater in extent than the end portions IE to facilitate insertion and accommodation thereof, as is obvious. Otherwise, however, whether staples or other securing means are employed, the zones of securement extend as closely as practicable towards the tops of the end walls and end flaps, so that the unsecured portions will be held against each other as tightly as possible. This provides for the most secure retention possible of the end portions la in the pockets, and consequently of the top flaps IS in their positions bridging the top of the container and holding the end'walls against movement away The construction of the ends of the container provides, in effect, a strong frame around each end wall I9, the flaps l6, l1, and 2| providinga' double thickness of material at the edges with a triple thickness at the corners. The side flaps 20 give a double thickness at the ends of the side walls I4 and abut the end wall reinforcements at right angles to buttress the container ends. Here again the angle member principle adds strength while saving material. Besides strengthening the end walls against shocks, the arrangement of the flaps l1 and gives the container great stacking strength, and also resists weaving. The strengthening effect of the top flaps has'already been pointed out, as well as the advantage of the hand hole reinforcement. The increased container strength resulting from this invention permits use of lighter, cheaper material than otherwise necessary for containers of a given strength, or alternatively gives increased strength to containers of a given material.
Of course, the container of this invention is not suitable to all products, for example those whose packing would be interfered with by the flaps inside the container. It does have a very wide field of use, however, and in this field is highly advantageous, as explained above.
It will be clear that many changes and modifications may be made in the disclosed embodiment without departing from the principles of the invention, and it is, therefore, not intended that the invention be limited otherwise than required by the spirit and scope of the appended claim.
What is claimed is:
A substantially open topped paperboard container comprising a bottom, two pairs of opposed side walls, a pair of narrow top flaps each extending the length of and hinged on one side wall of a first pair of opposed side walls and being swingable to close the top of said container along two edges thereof only, leaving the major portion open, ,end flap portions on said top flaps of substantially the same width as said top flaps and extending from said top flaps, said end flap portions being foldable to extend substantially perpendiculanthereto, a narrow reinforcing strip of material overlying and secured to each vertical marginal portion of the second pair of opposed side walls adjacent said first pair of side walls, each said reinforcing strip being unsecured adjacent the top of said second pair of side walls over an area only slightly greater than the top flap end portion adjacent thereto to provide a pocket for frictional reception of said end portion upon movement of the top flap to said partial closing position for holding said top flap in said position, the top flaps including the end flap portions being of approximately the same width as the marginal reinforcing strips whereby each end portion is adapted to be substantially housed within its respective pocket.
RAYMOND 'H. VAN SAUN.
REFERENCES CITED The following references are of recorddn the file of this patent:
UNITED STATES PATENTS.